Hi,
I have read (Antares Trader) and noticed, when upgrading to Active Record 2.0.2, that not using a logger can cause NilClass errors, more specifically the error "undefined method `debug' for nil:NilClass".
There is an opened ticket for about 5 months about this (http://dev.rubyonrails.org/ticket/10535).
I'm unsure if this is a bug, or if we do all have to include